fix(plugin-server): skip 413 on webhook send for now

[bretthoerner]

Problem

Taking lag, going to more deeply investigate these large payloads later.

Changes

Drop huge payloads.

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week.

[posthog-bot]

This PR was closed due to lack of activity. Feel free to reopen if it's still relevant.